daughters; at ichneumonidæ feeding within the
living living 1869 1872 | live 1859 1860 1861 1866 |
bodies of caterpillars;
and and 1859 1860 1861 1866 1869 | or 1872 |
at other such cases. The wonder indeed is, on the theory of natural selection, that more cases of the want of absolute perfection have not been
observed. observed. 1859 1860 1861 1866 1869 | detected. 1872 |
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The complex and little known laws governing
acknowledged variations acknowledged variations 1869 |
variation 1859 1860 1861 1866 |
the production of varieties 1872 |
are the same, as far as we can
see, see, 1859 1860 1861 1866 1869 | judge, 1872 |
with the laws which have governed the production of
so-called specific differences. so-called specific differences. 1869 |
so-called specific forms. 1859 1860 1861 1866 |
distinct species. 1872 |
In both cases physical conditions seem to have produced
some direct and definite effect, but how much we cannot say. some direct and definite effect, but how much we cannot say. 1869 1872 |
but little direct effect; yet when varieties enter any zone, they occasionally assume some of the characters of the species proper to that zone. 1859 1860 1861 1866 |
Thus
when varieties enter any new station, they occasionally assume some of the characters proper to the species of that station.
In In 1859 1860 1861 1866 1869 | With 1872 |
both varieties and species, use and disuse seem to have produced
a considerable a considerable 1869 1872 | some 1859 1860 1861 1866 |
effect; for it is
impossible impossible 1869 1872 | difficult 1859 1860 1861 1866 |
to resist this
....... 1861 1866 1869 1872 | con- 1859 1860 |
conclusion conclusion 1861 1866 1869 1872 | clusion 1859 1860 |
when we look, for instance, at the logger-headed duck, which has wings incapable of flight, in nearly the same condition as in the domestic duck; or when we look at the burrowing
tucutucu, tucutucu, 1859 1860 1861 1866 1869 | tucu-tucu, 1872 |
which is occasionally blind, and then at certain moles, which are habitually blind and have their eyes covered with skin; or when we look at the blind animals inhabiting the dark caves of America and Europe.
In In 1869 | In both 1859 1860 1861 1866 | With 1872 |
varieties and
species species 1859 1860 1861 1866 1869 | species, 1872 |
correlated correlated 1869 1872 | correlation 1859 1860 1861 1866 |
variation variation 1869 1872 | of growth 1859 1860 1861 1866 |
seems to have played
an an 1869 1872 | a most 1859 1860 1861 1866 |
important part, so that when one part has been modified other parts
have been have been 1869 1872 | are 1859 1860 1861 1866 |
necessarily modified.
In In 1859 1860 1861 1866 1869 | With 1872 |
both varieties and
species species 1859 1860 1861 1866 1869 | species, 1872 |
reversions to long-lost characters
occur. occur. 1859 1860 1861 1866 1869 | occasionally occur. 1872 |
How inexplicable on the theory of creation is the
occasional occasional 1859 1860 1869 1872 | variable 1861 1866 |
appearance of stripes on the
shoulders shoulders 1866 1869 1872 | shoulder 1859 1860 1861 |
and legs of the several species of the horse-genus and
of of 1866 1869 1872 | in 1859 1860 1861 |
their
hybrids! hybrids! 1859 1860 1861 1866 1869 |
hybrids! How simply is this fact explained if we believe that these species are all descended from a striped progenitor, in the same manner as the several domestic breeds of the pigeon are descended from the blue and barred rock-pigeon! 1872 |
How simply is this fact explained if we believe that these species
are all are all 1869 | have 1859 1860 1861 1866 |
descended descended 1859 1860 1861 1869 | all descended 1866 |
from a striped progenitor, in the same manner as the several domestic breeds of
the pigeon are the pigeon are 1869 |
pigeon have 1859 1860 1861 1866 |
descended from the blue and barred rock-pigeon!
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